Which category of requirements applies to health care facility gas systems whose failure could cause imminent major injury or death?

• A. Category 1
• B. Category 2
• C. Category 3
• D. Category 4

Answer: (A)

Medical gas systems are classified by the consequences of their failure, with the highest category reserved for systems where failure could cause imminent major injury or death. In that category, the requirements are the strictest because patient safety hinges on immediate gas availability. This means the system must have independent, reliable sources, redundancy, continuous monitoring and alarms, and rigorous verification and maintenance to prevent or quickly detect faults. Other categories exist for failures with less immediate risk, and they carry progressively less stringent demands. So when failure could lead to imminent major harm, the applicable category is the highest one.